Technical data for Zirconium

Overview Name Zirconium Symbol Zr Atomic Number 40 Atomic Weight 91.224 Density 6.511 g/cm3 Melting Point 1855 °C Boiling Point 4409 °C Thermal properties Phase Solid Melting Point 1855 °C Boiling Point 4409 °C Absolute Melting Point 2128 K Absolute Boiling Point 4682 K Critical Pressure N/A Critical Temperature N/A Heat of Fusion 21 kJ/mol Heat of Vaporization 580 kJ/mol Specific Heat 278 J/(kg K)[note] Adiabatic Index N/A Neel Point N/A Thermal Conductivity 23 W/(m K) Thermal Expansion 5.7×10-6 K-1 Bulk physical properties Density 6.511 g/cm3 Density (Liquid) 5.8 g/cm3 Molar Volume 0.000014011 Brinell Hardness 650 MPa Mohs Hardness 5 Vickers Hardness 904 MPa Bulk Modulus N/A Shear Modulus 33 GPa Young Modulus 67 GPa Poisson Ratio 0.34 Refractive Index N/A Speed of Sound 3800 m/s Thermal Conductivity 23 W/(m K) Thermal Expansion 5.7×10-6 K-1 Reactivity Valence 4 Electronegativity 1.33 ElectronAffinity 41.1 kJ/mol Ionization Energies 640.1, 1270, 2218, 3313, 7752, 9500 kJ/mol Health and Safety DOT Hazard Class 4.2 DOT Numbers 2008 RTECS Number N/A NFPA Label

Classifications Alternate Names None Names of Allotropes None Block d Group 4 Period 5 Series Transition Metal Electron Configuration [Kr]5s24d2 Color Silver Discovery 1789 in Germany Gas phase N/A CAS Number CAS7440-67-7 CID Number CID23995 RTECS Number N/A Electrical properties Electrical Type Conductor Electrical Conductivity 2.4×106 S/m Resistivity 4.2×10-7 m Ω Superconducting Point 0.61 Magnetic properties Magnetic Type Paramagnetic Curie Point N/A Mass Magnetic Susceptibility 1.68×10-8 m3/Kg Molar Magnetic Susceptibility 1.53×10-9 m3/mol Volume Magnetic Susceptibility 0.000109 Abundances % in Universe 5×10-6% % in Sun 4×10-6% % in Meteorites 0.00066% % in Earth's Crust 0.013% % in Oceans 2.6×10-9% % in Humans 5×10-6% Atomic dimensions and structure Atomic Radius 206 pm Covalent Radius 175 pm Van der Waals Radius N/A Crystal Structure Simple Hexagonal Lattice Angles π/2, π/2, 2 π/3 Lattice Constants 323.2, 323.2, 514.7 pm Space Group Name P63/mmc Space Group Number 194 Nuclear Properties Half-Life Stable Lifetime Stable Decay Mode N/A Quantum Numbers 3F2 Neutron Cross Section 0.184 Neutron Mass Absorption 0.00066 Known Isotopes 78Zr, 79Zr, 80Zr, 81Zr, 82Zr, 83Zr, 84Zr, 85Zr, 86Zr, 87Zr, 88Zr, 89Zr, 90Zr, 91Zr, 92Zr, 93Zr, 94Zr, 95Zr, 96Zr, 97Zr, 98Zr, 99Zr, 100Zr, 101Zr, 102Zr, 103Zr, 104Zr, 105Zr, 106Zr, 107Zr, 108Zr, 109Zr, 110Zr Stable Isotopes 90Zr, 91Zr, 92Zr, 94Zr Isotopic Abundances 90Zr 51.45% 91Zr 11.22% 92Zr 17.15% 94Zr 17.38% 96Zr 2.8%